Mac OS X Cocoa多视图应用程序导航

概述我已经花了整整2天试图弄清楚如何使用NSViewControllers来创建一个多视图应用程序. 这就是我的工作. 我有2个视图控制器和MainMenu.xib的窗口. 我还有一个AppController,它是两个视图控制器的委托. 当我启动应用程序时,我首先会遇到MainMenu.xib的Window视图,其中包含一个按钮.单击此按钮,IBAction将发送到appController,并要求 我已经花了整整2天试图弄清楚如何使用NSVIEwControllers来创建一个多视图应用程序.

这就是我的工作.

我有2个视图控制器和MainMenu.xib的窗口.
我还有一个AppController,它是两个视图控制器的委托.

当我启动应用程序时,我首先会遇到MainMenu.xib的Window视图,其中包含一个按钮.单击此按钮,IBAction将发送到appController,并要求SecondVIEwController显示它的nib.到目前为止,一切都很好,nib文件正确显示.

在secondVIEwController上,还有另一个按钮,它将另一个IBAction发送到appController,并要求显示FirstVIEwController,但没有任何反应,
没有崩溃,没有警告……任何帮助将不胜感激……
提前感谢您的耐心等待……

这是AppController.h的代码：

#import <Foundation/Foundation.h>#import "SecondVIEwController.h"#import "FirstVIEwController.h"@interface AppController : NSObject@property (strong) IBOutlet NSWindow *mainWindow;@property (strong) IBOutlet SecondVIEwController *secondVIEwController;@property (strong) IBOutlet FirstVIEwController *firstVIEwController;- (IBAction)secondbuttonfromsecondVIEwControllerClicked:(ID)sender;- (IBAction)buttonClicked:(ID)sender;@end

这是AppController.m的代码：

#import "AppController.h"@implementation AppController@synthesize mainWindow = mainwindow;@synthesize secondVIEwController;@synthesize firstVIEwController;- (IBAction)buttonClicked:(ID)sender {     NSLog(@"button from second VIEw Controller clicked");     self.secondVIEwController = [[SecondVIEwController       alloc]initWithNibname:@"SecondVIEwController" bundle:nil];     self.mainWindow.contentVIEw = self.secondVIEwController.vIEw;     [self.secondVIEwController.vIEw setautoresizingMask:NSVIEwWIDthSizable |      NSVIEwHeightSizable];} - (IBAction)secondbuttonfromsecondVIEwControllerClicked:(ID)sender {     NSLog(@"button from first VIEwController clicked");     self.firstVIEwController = [[FirstVIEwController      alloc]initWithNibname:@"FirstVIEwController" bundle:nil];     self.mainWindow.contentVIEw = [self.firstVIEwController vIEw];}@end

好吧,任何人都可以帮助我,我只需要一个视图应用程序,在第一个vIEwController上显示第一个带有按钮的VIEwController,它带我到第二个视图控制器,第二个按钮带我回到我的第一个vIEwcontroller ……我已经花了一个多星期的时间…徒劳…… PS：我不想在mainMenu.xib窗口上有任何按钮,也不需要标签.

解决方法 这是我的问题的解决方案.

这是AppDelegate.h的代码：

//  AppDelegate.h #import <Cocoa/Cocoa.h> #import "FirstVIEwController.h" #import "SecondVIEwController.h" //We need to declare the AppDelegate class as being the delegate for both  //FirstVIEwController and SecondVIEwController @interface AppDelegate : NSObject <NSApplicationDelegate,FirstVIEwControllerDelegate,SecondVIEwControllerDelegate> @property (strong,nonatomic) NSWindow *window; @property (strong) FirstVIEwController *firstVIEwController; @property (strong) SecondVIEwController *secondVIEwController; -(voID) goToSecondVIEw; -(voID) goToFirstVIEw; @end

现在,这是AppDelegate.m：

//  AppDelegate.m #import "AppDelegate.h" @implementation AppDelegate @synthesize window = _window; @synthesize firstVIEwController; @synthesize secondVIEwController; -(voID) awakeFromNib { [self goToFirstVIEw]; self.firstVIEwController.delegate = self; } -(voID) goToSecondVIEw {        if (self.secondVIEwController ==nil) {            self.secondVIEwController =[[SecondVIEwController alloc]             initWithNibname:@"SecondVIEwController" bundle:nil];        }        self.window.contentVIEw = [self.secondVIEwController vIEw];  } -(voID) goToFirstVIEw { if (self.firstVIEwController ==nil) {     self.firstVIEwController =[[FirstVIEwController alloc]      initWithNibname:@"FirstVIEwController" bundle:nil];   }    self.window.contentVIEw = [self.firstVIEwController vIEw]; } @end

接下来,我们需要在FirstVIEwController和SecondVIEwController中设置委托

//  FirstVIEwController.h#import <Cocoa/Cocoa.h>#import "SecondVIEwController.h"//We declare the delegation protocole:@protocol FirstVIEwControllerDelegate <NSObject>-(voID)goToSecondVIEw;@end@interface FirstVIEwController : NSVIEwController- (IBAction)firstVIEwControllerbuttonClicked:(ID)sender;@property (nonatomic,strong) ID <FirstVIEwControllerDelegate> delegate;@end

这是FirstVIEwController.m：

//  FirstVIEwController.m #import "FirstVIEwController.h" @implementation FirstVIEwController @synthesize delegate; - (ID)initWithNibname:(Nsstring *)nibnameOrNil bundle:(NSBundle *)nibBundleOrNil{   self = [super initWithNibname:nibnameOrNil bundle:nibBundleOrNil];   if (self) {    self.delegate = [NSApp delegate];    }   return self; } - (IBAction)firstVIEwControllerbuttonClicked:(ID)sender {   NSLog(@"button from first VIEw Controller clicked");   if ([self.delegate respondsToSelector:@selector(goToSecondVIEw)]) {    [self.delegate goToSecondVIEw];   } } @end

现在,SecondVIEwController也是如此：

//  SecondVIEwController.h #import <Cocoa/Cocoa.h> @protocol SecondVIEwControllerDelegate <NSObject> -(voID)goToFirstVIEw; @end @interface SecondVIEwController : NSVIEwController @property (nonatomic,strong) ID <SecondVIEwControllerDelegate> delegate; - (IBAction)goToFirstVIEwControllerbuttonClicked:(ID)sender; @end

这是SecondVIEwController.m：

//  SecondVIEwController.m  #import "SecondVIEwController.h"  @interface SecondVIEwController ()  @end  @implementation SecondVIEwController  - (ID)initWithNibname:(Nsstring *)nibnameOrNil bundle:(NSBundle *)nibBundleOrNil{  self = [super initWithNibname:nibnameOrNil bundle:nibBundleOrNil];  if (self) {      self.delegate = [NSApp delegate];   }    return self;  }  - (IBAction)goToFirstVIEwControllerbuttonClicked:(ID)sender {    NSLog(@"button from Second VIEw Controller clicked");    if ([self.delegate respondsToSelector:@selector(goToFirstVIEw)]) {    [self.delegate goToFirstVIEw];  } } @end

好吧,我想这段代码可能会有所改进,如果您有任何建议,请随时告诉我.希望它会帮助别人.

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